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A140307
Number of n X n binary matrices containing at most four 1's in any 3 X 3 sub-block.
0
1, 2, 16, 256, 15982, 3082378, 1476568000, 2280441045555, 10599616558936358, 140380164790852384033
OFFSET
0,2
CROSSREFS
Cf. A139810.
Sequence in context: A019318 A090727 A108242 * A114039 A090305 A358145
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 27 2008
STATUS
approved